diff options
Diffstat (limited to 'src/image')
| -rw-r--r-- | src/image/efi_image.c | 126 |
1 files changed, 124 insertions, 2 deletions
diff --git a/src/image/efi_image.c b/src/image/efi_image.c index 0575496c..9b9e7600 100644 --- a/src/image/efi_image.c +++ b/src/image/efi_image.c @@ -19,13 +19,95 @@ FILE_LICENCE ( GPL2_OR_LATER ); #include <errno.h> +#include <stdlib.h> #include <ipxe/efi/efi.h> #include <ipxe/image.h> #include <ipxe/init.h> #include <ipxe/features.h> +#include <ipxe/uri.h> FEATURE ( FEATURE_IMAGE, "EFI", DHCP_EB_FEATURE_EFI, 1 ); +/** EFI loaded image protocol GUID */ +static EFI_GUID efi_loaded_image_protocol_guid = + EFI_LOADED_IMAGE_PROTOCOL_GUID; + +/** + * Create a Unicode command line for the image + * + * @v image EFI image + * @v devpath_out Device path to pass to image (output) + * @v cmdline_out Unicode command line (output) + * @v cmdline_len_out Length of command line in bytes (output) + * @ret rc Return status code + */ +static int efi_image_make_cmdline ( struct image *image, + EFI_DEVICE_PATH **devpath_out, + VOID **cmdline_out, + UINT32 *cmdline_len_out ) { + char *uri; + size_t uri_len; + FILEPATH_DEVICE_PATH *devpath; + EFI_DEVICE_PATH *endpath; + size_t devpath_len; + CHAR16 *cmdline; + UINT32 cmdline_len; + size_t args_len = 0; + UINT32 i; + + /* Get the URI string of the image */ + uri_len = unparse_uri ( NULL, 0, image->uri, URI_ALL ) + 1; + + /* Compute final command line length */ + if ( image->cmdline ) { + args_len = strlen ( image->cmdline ) + 1; + } + cmdline_len = args_len + uri_len; + + /* Allocate space for the uri, final command line and device path */ + cmdline = malloc ( cmdline_len * sizeof ( CHAR16 ) + uri_len + + SIZE_OF_FILEPATH_DEVICE_PATH + + uri_len * sizeof ( CHAR16 ) + + sizeof ( EFI_DEVICE_PATH ) ); + if ( ! cmdline ) + return -ENOMEM; + uri = (char *) ( cmdline + cmdline_len ); + devpath = (FILEPATH_DEVICE_PATH *) ( uri + uri_len ); + endpath = (EFI_DEVICE_PATH *) ( (char *) devpath + + SIZE_OF_FILEPATH_DEVICE_PATH + + uri_len * sizeof ( CHAR16 ) ); + + /* Build the iPXE device path */ + devpath->Header.Type = MEDIA_DEVICE_PATH; + devpath->Header.SubType = MEDIA_FILEPATH_DP; + devpath_len = SIZE_OF_FILEPATH_DEVICE_PATH + + uri_len * sizeof ( CHAR16 ); + devpath->Header.Length[0] = devpath_len & 0xFF; + devpath->Header.Length[1] = devpath_len >> 8; + endpath->Type = END_DEVICE_PATH_TYPE; + endpath->SubType = END_ENTIRE_DEVICE_PATH_SUBTYPE; + endpath->Length[0] = 4; + endpath->Length[1] = 0; + unparse_uri ( uri, uri_len, image->uri, URI_ALL ); + + /* Convert to Unicode */ + for ( i = 0 ; i < uri_len ; i++ ) { + cmdline[i] = uri[i]; + devpath->PathName[i] = uri[i]; + } + if ( image->cmdline ) { + cmdline[uri_len - 1] = ' '; + } + for ( i = 0 ; i < args_len ; i++ ) { + cmdline[i + uri_len] = image->cmdline[i]; + } + + *devpath_out = &devpath->Header; + *cmdline_out = cmdline; + *cmdline_len_out = cmdline_len * sizeof ( CHAR16 ); + return 0; +} + /** * Execute EFI image * @@ -34,7 +116,12 @@ FEATURE ( FEATURE_IMAGE, "EFI", DHCP_EB_FEATURE_EFI, 1 ); */ static int efi_image_exec ( struct image *image ) { EFI_BOOT_SERVICES *bs = efi_systab->BootServices; + union { + EFI_LOADED_IMAGE_PROTOCOL *image; + void *interface; + } loaded; EFI_HANDLE handle; + EFI_HANDLE device_handle = NULL; UINTN exit_data_size; CHAR16 *exit_data; EFI_STATUS efirc; @@ -47,21 +134,56 @@ static int efi_image_exec ( struct image *image ) { /* Not an EFI image */ DBGC ( image, "EFIIMAGE %p could not load: %s\n", image, efi_strerror ( efirc ) ); - return -ENOEXEC; + rc = -ENOEXEC; + goto err_load_image; } + /* Get the loaded image protocol for the newly loaded image */ + efirc = bs->OpenProtocol ( handle, &efi_loaded_image_protocol_guid, + &loaded.interface, efi_image_handle, + NULL, EFI_OPEN_PROTOCOL_GET_PROTOCOL ); + if ( efirc ) { + /* Should never happen */ + rc = EFIRC_TO_RC ( efirc ); + goto err_open_protocol; + } + + /* Pass an iPXE download protocol to the image */ + if ( ( rc = efi_download_install ( &device_handle ) ) != 0 ) { + DBGC ( image, "EFIIMAGE %p could not install iPXE download " + "protocol: %s\n", image, strerror ( rc ) ); + goto err_download_install; + } + loaded.image->DeviceHandle = device_handle; + loaded.image->ParentHandle = efi_loaded_image; + if ( ( rc = efi_image_make_cmdline ( image, &loaded.image->FilePath, + &loaded.image->LoadOptions, + &loaded.image->LoadOptionsSize ) ) != 0 ) + goto err_make_cmdline; + /* Start the image */ if ( ( efirc = bs->StartImage ( handle, &exit_data_size, &exit_data ) ) != 0 ) { DBGC ( image, "EFIIMAGE %p returned with status %s\n", image, efi_strerror ( efirc ) ); + rc = EFIRC_TO_RC ( efirc ); + goto err_start_image; } - rc = EFIRC_TO_RC ( efirc ); + /* Success */ + rc = 0; + + err_start_image: + free ( loaded.image->LoadOptions ); + err_make_cmdline: + efi_download_uninstall ( device_handle ); + err_download_install: + err_open_protocol: /* Unload the image. We can't leave it loaded, because we * have no "unload" operation. */ bs->UnloadImage ( handle ); + err_load_image: return rc; } |